Elevator-door-control system



Jan. 22, 1924. 1,481,466

\ w. H. HARTMAN ELEVATOR DOOR CONTROL SYSTEM Filed Dec. 2. 1920 a Sheets-Sheet 1 WITNESS INVENTOR fl h w /fi/aawnlw Av ATTORNEYS Jan. 22, 1924.

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WITNESS INVENTOR Jan. 22, 1924.

WITNESS v w. H. HARTMAN ELEVATOR noon CONTROL SYSTEM- Filed Deg. 2. 1920 3 Sheets-Sheet 3 w A TTORNE YS v' is particularlyapplioable to automatic push Fatented den. 22, E24.

DEFICE.

CONTROL AND HYDROMETRIC CORPORATION, OF LOS ANGELES, .CAL IFORNIA, A.

CORYORATION OF CALIFORNIA.

ELEVATOR-DOOR-CONTROL SYSTEM.

Application filed Decemberv 2, 1920. Serial No. 427,669.

MAN, a citizen of the United States, and a resident of Los Angeles, county, of Los Angeles, and State of California, have invented a certain new and useful Elevatorwhich the follow- I I are well known to persons skilled in the art,

Door-Control. System, of ing is a. specification.

The invention relates to elevator door control systems for use on automatic pus'h button elevators.

An object ofthe invention is to provide an automatic push button elevator which cannot be operated when a: shaftdoor. is

open or unlocked. 1

Another object of the invention is to provide an automatic push button elevator, in which a shaft door cannotbe openedunless the elevator car is opposit the door.

A furtherobject of the invention is to provide an automatic push buttonaelevator in which electrical contacts 'onthe "car for controlling the operation of the; doors are eliminated. i

A further object of the invention is to pro--v vide a simple, cheap,.and efficient door control system for automatic push button engages a seat 13 inthe bolt 7 to lock the bolt against withdrawal from the. casing.

elevators.

The invention possesses other advantageous features, someof which, withthe foregoing, willbe' set forth at length in-the following description where I-Zshall outline in full that'form of the inventionwhich I have selected for illustration inthe drawings accompanying and formingqpartof the present-specification. ;In said drawings, I,

have shown one embodiment- 0f the system of my invention, but it is to -be understood that I do not limit myself to such a form since the invention, as set forthin the claims, may be embodied in a plurality of forms.

Referring to said drawings: Figure 1 is an elevation of an elevator shaft having two shaft doors, provided with the system'of my invention.

Fig. 2'is a diagrammatic representation of the combination of elements entering into thesystem of my invention. Fig, .3 is an elevation, partly in section,'of the door lock in its openposition, in ass0ciation with thelock operating mechanism carried by the elevator car. V 1 Y The door control system ofmy-invention button elevators in which the elevator can automatically moves to and stops at a-floor predetermined by the pushing. of. a. selected button. The present invention'does notrelate to the control. system nor. operating mechanism forautomatic push buttonielevators and since such systems and mechanisms they will not be described herein. Inl;""ig.v 1,

vided for locking the, doors in the closed position and for unlocking the, door at the pre-selected floor, whenthecan arrives at the floor and these-means serve also to prevent the operationof the elevator, when any shaft door is open or unlocked. I

Arranged on theshaft structure-ateach floor is a lockcasing 6 into which a bolt 7 on thedoorslides and in which the boltis locked. Pivoted in the casing-is a three-- armed lever 8, thebarm 9 of which is-prov'idedon its end with a hook or projection :12 which The--leveris provided with an actuating arm 1%, which isengaged by the actuatinglever 15, projecting throughthe top of the casing and being provided on its .upperend w-ith a heavy roller 16 The lever-is also provided with 3.: laterally extending arm 17 which is provided-on its freeend with astud l8 having a. vertically disposed aperture; therethrough. I

. Rocking of the lever 15 moves the arm 9 to release th bolt 7, so that the door maybe opened and .means are provided within the casing for locking the arm 9 in the released position. Pivoted in the casing arextwo latches 21 and .22 .7 which function toklatch the :lever 8 in released-position. .Thehlever 21 is provided with anotch 23iwhic'h; engages apin 24 on thearm lt and" the lever 22has a notch 25 which engages a !pin- 261 on the-arm 9, thus locking the lever in released position. The latchesengage the end of the\bolt 7--and fall into engagement with the" pins gas the bolt is withdrawn from.;the-;lockwand are Means are provided for rocking the lever 15 to release the bolt when the elevator car reaches a floor, but this means is operative to release the bolt only at the floor predetermined by pushing the selected button. Pivotally mounted on a standard on the elevator car are two bent levers 27, pivoted at one end to a shoe or cam 28 and pivoted at the other end to a link 29 carrying a counterweight 31. The shoe or cam is vertically disposed and is positioned to contact with the roller 16 and operate the lever 15 when the car arrivesat a floor. The shoe is normally held in extended position by the counterweight, but is capable of being moved into retracted position. If the lever 15 is free to move, contact of the shoe with the roller will actuate the lever to release the bolt 7, but if the lever 15 is held against movement, then the shoe will be moved into retracted position as the elevator car passes the floor.

Means are provided for holding all of the levers 15 against movement except that one which is arranged at the floor selected by pushing the selected button. Disposed vertically in the elevator shaft is a wire or cable or rod 32 which passes through the apertures in the studs 18 and which is provided immediately above each stud with a stop or abutment 33 normally resting against the stud. The wire 32 is capable of vertical movement in the shaft and is moved vertically by the arm 17 when a lock is unlocked. The wire is connected at its upper end to a lever 34 and connected to the other side of the lever is a secondwire 35, depending in the shaft and carrying. a counterweight 36 on its lower end. In order to unlock a shaft door, it is necessary that the wire 32 be moved vertically, but means are provided for preventing the vertical movement of the wire, except when the car is at the selected floor, so that as the car moves in the shaft the doors passed by the car are not unlocked. Secured to the lower end of the wire 32 is an armature 37 disposed in a solenoid 38 which is sufliciently powerful, when energized, to prevent the counter weight 31 on the shoe from raising the arm 17. The solenoid is connected in the control circuit with the direction switch (not shown) which operates upon the pushing of a button to cause the car to move to the selected floor. The solenoid 38 is connected to the direction switch in such manner that the solenoid circuit is normally closed and is opened when the car reaches the selected floor. The car will, therefore, pass the other floors, without causing an unlocking of the door, but when the selected floor is reached, the solenoid circuit is opened permitting the wire 32 to be raised, thus permitting the door to be unlocked.

Means are further provided for prevent the car from being operated until everyshaft door is closed and locked. It has beenshown that the unlocking of any shaft door is accompanied by a raising of the wire 32 and the wire 32 cannot then be lowered until the door is again closed and locked, at which time the wire 32 descends by gravity. Movement of the wire 35 is concurrent with move ment of the wire 32 and I have employed the movement of the wire 35 to open and close a switch through which current is supplied to the car moving motor. Secured to the wire 35' and suitably insulated therefrom, is a contact bar 37 which is movable into and out of engagement with the contacts 38 and 39 of the power circuit and when the wire 32 is raised, wire 35 is lowered and the circuit between the contacts 38 and 39 is opened. This circuit is not again closed until the open door has been closed and locked.

I claim:

1. In an automatic elevator system having a car, a plurality of landings and doors for said landings, means for insuring that only that door can be opened, before which the car is to stop, comprising a lock for the selected door, means carried'by the car for opening the lock, said means bein adapted to perform by itself the opening of the lock, and means for holding the lock in closed position except when the car reaches the selected door.

2. In an automatic elevator system having a car, a plurality of landings, and doors for the landings, means for insuring that only that door can be opened before which the car is to stop, comprising locks for the doors, a single mechanical means for keeping all of the locks closed, electrically controlled means for rendering said means inoperative when the car approaches the selected door, and means carried by the'car for opening the lock.

3. In an automatic elevator system having a car, a plurality of landings,and doors for the landings, means for insuring that only that door can be opened before which the car is to stop, comprising locks for the doors, means carried by the car for unlocking the doors, means cooperating with the locks for preventing the locks from being opened, and means responsive to the movement of the car to the selected door for rendering said last mentioned means inactive. i

4:. In an elevator system having a car, means for moving the car, a plurality of landings, and doors for the landings, locks for the doors, a member arranged to keep the locks in closed position, and means for rendering said member inoperative in response to the arrival of a car at a selected position. i

5. In an elevator system having a car, a plurality of landings, and doors for the landings, locks for the doors, a member arranged to keep the locks in closed position, means responsive to the arrival of a car at a selected position for rendering said means inoperative, and means for preventing the movement of the car responsive to the inoperative condition of the member arranged to keep the locks closed.

6. The combination of a car, a door, a locking mechanism comprising a car-controlled releasing device having a car-actuated power-exerting member, and automatic means to restrain the releasing action of said device while the car is in motion.

7. The combination of a car, a door, a locking device including a member on the door, a movable latch member, cooperating stationary and movable members, the movable member being carried by the car and the stationary member being in the path of the movable member as the car travels, means for transmitting movement from the movable member to said movable latch member, and automatic means to restrain movement of said movable latch member when the car is in motion, and to allow it to move when the car is at rest.

8. In a device of the class described, the combination of a locking mechanism comprising a member carried by the door, a

ment of the door member independently of said latch.

In testimony whereof, I have hereunto set my hand.

WILLIAM H. HARTMAN. 

